30 THE SIMPLE TISSUES. 



stained. Wash with water acidulated with acetic acid, and 

 replace the latter by glycerin. (//) Find the nuclei of the 

 large salivary gland cells, and in them the coiled and obvious 

 nuclear filamena. 



V.S. Jaw of young newt. (p. 9, s. 22, c. P., m. B.) Find 

 amongst the lower epidemic cells nuclei, showing the convolute 

 and aster stages, these are the most easy of recognition. 



Columnar epithelium. V.S. Stomach of an adult cat. 

 (p. 3, s. 22 & 24, c. P., m. B.) (L) Recognise the ducts of 

 the gastric follicles, wide and somewhat oval recesses into which 

 the tubular gastric glands open. (//) Their cavities as well as 

 the general surface of the stomach are covered with this variety 

 of epithelium. The cells are taller than they are broad, are 

 enclosed in a thin cell membrane, the contents of which are clear 

 and traversed by a delicate cytoplasmic network, the nucleus 

 is placed near the attached end. Under certain methods of 

 treatment intercellular bridges are seen between them (Carlier). 



Epithelium of the small intestine. V.S. Small intestine 

 cat, dog, or newt. (p. 11, s. 22 & 24, c. P., m. B.) 



(L) Find the villi, column-like projections of the mucosa into 

 the cavity of the gut. On their surface (//) a single layer of 

 columnar nucleated cells, with a marginal hem on their free 

 surface. This is the sectional appearance of the end plate, 

 which is probably composed of short prismatic rods set close 

 together on the end of the cell. Sections of the cells showing the 

 plates in surface view are to be sought for, they appear as polygonal 

 areas with fine punctate markings. In the intestine of the cat, 

 among the columnar cells, Whatney's buds may frequently be 

 met with, these consist of zones of cells arranged transversely 

 around the villi, which in sectional view appear as clusters of 

 cells tapering towards their free ends. Whatney described 



